Contact for cartridge fuses



Jul 27, 1937. R. REEH CONTACT FOR CARTRIDGE FUSES Filed Feb. 16, 1957 Fl.1. 5 g 29 Inventor I Rudolf 'Reeh,

H i s Attorrwey Patented July 27, 1937 CONTACT FOR CARTRIDGE FUSESRudolf Iteeh, Dresden-Laubegast, Germany, assignor to General ElectricCompany, a corporation of New York ApplicationFcbruary 16, 1937, SerialNo. 126,027

In Germany May12, 1936 4 Claims. (01. 200-134) The invention relates tocontacts forcartridge fuses, which is distinguished by its simpleconstruction, dependability in closing the circuit and ease ofoperation. According to the invention, it is so designed that followingwithdrawal of the cartridge the contact remains open, and when thecartridge is pressed in, it closes automatically. For this purpose, thecontact is kept open by a latch member, which, when the cartridge ispressed in, releases the locking movement of the contact jaws. Thecontact jaws and the latch member are subject to spring action. Thelatch member is expediently made to participate in the transmission ofcurrent; The new construction has the advantage that the cartridge, whenpressed in, is subject to little mechanical stress, and the contactjaws, when the cartridge is pressed in, act to holdit veryrigidly and ingood contact; Moreover thereis the advantage that supplementarycontacts, e. g.

clipped-on clamps, blades, etc. are not required even when the diameterof the cartridge is great.

The contact is expediently so designed that the cartridge is notdisplaceable in its longitudinal direction.

The figures show. a constructional example of' the inventive idea, Fig.1 illustrating the contact in the closed, Fig. 2 in the open condition,5

and Fig. 3 in side elevation. As shown in the drawing, the contact jawsl have arcuate extensions 2 on the inner sides thereof for embracing thecylindrical end ter-- minal 3 of the fuse and are pivoted at one end toa bearing block 4, while the outer ends are provided with offset lugs 5to which the ends of a tension spring 6 are connected and by which thejaws are normally drawn inwardly into firm engagement with the fuseterminal 3.

In order to hold the jaws in open position, as shown in; Fig. 2following withdrawal of the fuse, a latch member 'I' is disposed betweenthem adjacent their pivotal ends and yieldingly supported on compressionsprings 8 attached to the bearing block 4. The outer surface of member Iis also'arcuate to make extended contact with the fuse terminal 3 andits ends are stepped at 9 so that when in depressed position, as shown 5in Fig. 1, they are clear of the contact extensions 2 and when thecontacts have been spread apart by removal of the fuse therefrom, thelower portions of the ends 9 abut upon the extensions of the contacts.The latch member I is 10 moved outwardly into locking position by thesprings '8 as the fuse is withdrawn from the contact jaws.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is: l5

1. A contact for cartridge fuses comprising two jaws biased toward eachother, and latching means releasably holding them. spread apart anddisplaceable to free the jaws upon insertion of a fuse into saidcontact. 20

2. A' 'contact'for cartridge fuses comprising two jaws provided witharcuate fuse engaging surfaces, means for biasing the jaws toward eachother, spring-pressed latching means to releasably hold said jaws spreadapart and 25 placeable upon insertion of a fuse into said contact.

3. A contact for cartridge fuses comprising two jaws provided internallywith projections having arcuate fuse engaging surfaces, a spring-pressed30 latch adapted to move between and engage said i projections when saidjaws are spread apart. 4. A contact for cartridge fuses comprising ametal block, two jaws with arcuate contact surfaces pivoted to saidblock, spring meansurging 35 said jaws toward each other, and a latchwith arcuate contact surface yieldin'gly connected to said-block-'andadapted upon removal of the fuse to move into position between saidjaws to hold them spread apart, 4o

- RUDOLI' REEH.

